A whip-based tripper and disarmer could work. Or you could go for a twf build with a whip and short sword if you're worried about doing actual damage but I think it's too feat intensive for too little reward since your summons or charmed creatures should be doing the actual damage. Spell focus (enchantment) and greater spell focus (enchantment) could be good too depending on the spell list.
Anyways my build would be:
1-combat expertise, improved trip ,3-improved disarm, 6-spell focus: enchantment, 9-greater spell focus: enchantment, 12-heighten spell, 15-spell penetration, 18-greater spell penetration
Spellwise I'd get summon monster I, silent image, and charm monster on there replacing feather fall, unseen servant, and major image.